I got that. But I just don't know how to generate the script. Can you tell me please?

>You don't have to but you can if you are interested to know how it's done.
>
>>I'm sorry I don't understand fully.
>>
>>In SSMS I click Design, and remove the identity property. Before pressing Ctrl+S, I guess I should generate a scipt. But how? It's not in the Script Table as-menu.
>>
>>
>>>SQL Server doesn't have command to add or remove IDENTITY property of a column. You can do it in SSMS. Generate a script before applying changes to see how it's done.
>>>